error in installation

Hi
I have an error after drupalVB installation :

Warning: Table 'pthrzerc_vb.vb_system' doesn't exist query: SELECT * FROM vb_system WHERE type = 'theme' in /home/pthrzerc/public_html/soft/includes/database.mysql.inc on line 172

Warning: Table 'pthrzerc_vb.vb_watchdog' doesn't exist query: INSERT INTO vb_watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Table 'pthrzerc_vb.vb_usergroup' doesn't exist\nquery: SELECT usergroupid, title FROM vb_usergroup در /home/pthrzerc/public_html/soft/includes/database.mysql.inc خط 172.', 2, '', 'http://www.p30cyber.com/soft/admin/settings/drupalvb', 'http://www.p30cyber.com/soft/admin', '217.218.247.4', 1214895617) in /home/pthrzerc/public_html/soft/includes/database.mysql.inc on line 172

Warning: Table 'pthrzerc_vb.vb_watchdog' doesn't exist query: INSERT INTO vb_watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Table 'pthrzerc_vb.vb_setting' doesn't exist\nquery: SELECT varname, value FROM vb_setting در /home/pthrzerc/public_html/soft/includes/database.mysql.inc خط 172.', 2, '', 'http://www.p30cyber.com/soft/admin/settings/drupalvb', 'http://www.p30cyber.com/soft/admin', '217.218.247.4', 1214895617) in /home/pthrzerc/public_html/soft/includes/database.mysql.inc on line 172

what is this ?